Tool holder



Feb. 28, 1933. I F {HARRlNGTON I 1,899,326

TOOL HOLDER Filed May 11, 1931 2? 21 23 24 l7 Y\ \L /5 INVENTOR ,frrggg 77/14)")?? 6021 ATTORNEYS V 35 Figure 2 is a Patented Fel.':.;28,'1933:

- UNITED STATES5PATENT QEFI a Exams '1. nnnitrne'rom or nnrnorr; m-rcmonmnsslenon TO wnrrmnn, azisnimnsi mconronnrnn on DETROIT; MICHIGAN, A conronn'rronor MICHIGAN,

- "r001. Harman- Application filed May n,

This invention. relates generally to tools I holders and has particular reference to a construction and arrangement of-parts tendr. ing to simplify, render more efiicient and prove generallydevices of thischaracter. I, One ofthe principal objects of this invention is to provide a tool holder or jretainerc the novel, and expedient distinguished by D the same may be man1pumanner in L which 10 lated to interchangeably: receive tools of the desired size or type.

Another advantageous vention resides in the provision of a retainer equi ped with a locking device constructed to e ectively hold the toolagainst axial and rotativemovement relative to the retainer and in addition designed to prevent .accidental rotation; thereof relative to the retainer when in operative position; I V; i A further advantageous feature of thisin- ,vention is to associatesupplemental'means,

with "the retainer andlocking device preventing any possibilityof the latter turning,

during operation,

proceeds, especially when considered in coni nection with the accompanying drawing, so wherein: W t r Figure l'is inv n n; v u 1 v plan viewof thetoolholder shown in Figure 1; p o.

Figure -is aside elevational vie'w'of the locking devicefor the tool holder;

- Figure 4 is a plan new of the device shown i l i I ber 20 having a shank portion 21'journaledQ within a bore 22' formed in the retainer with 7 Figures 7 and 8 are views similar to Fig- Figure 7 in assembled relation with a redesign provided with a Cylindrical bore for I feature of "this in-s The foregoing weuasl th i i i diversified applications,nevertheless, for the be made more apparent ,as this description a fragmentary sectional view through a punch press equipped with a toolholderpconstructed in accordance with this 1931. Serial, No. 536,646.

ures 3 and 4 showing'a slightly modified form of construction; a

a Figure 9 is a view similar to, Figure 2 showing the locking device illustrated in tainer. i a a In general, the present invention-consists inthe provision of a retainer of conventional recelving theshank of va tool and having a lockingidevice journaled therein for rotation about an axis parallel to the axis of the tool for locking the same in the retainer. As will be more fully hereinafter described, the lock.- ing'device performsa three-fold function in that it, notonly effectively holds the punch Jagainst axial and rotativ'e movement withrespect to'theretainer, but also is provided with means. cooperatingwith means on theretainer for positively preventing, rotation thereof relative to the retainer. a l

'While it willbe apparent as this description proceeds that the various ,toolcholders shownherein are capable of numerous and] purpose of illustration I have shown the same as used in connection with" a punch press fragmentarily shown in'Figurelrand desig-' v nated by the reference' character 15. Re-.. I ferringinow more in detail tothe particular construction of the tool i holder shown in "Figuresl to 6, inclusive, it-Will be noted that Ithesame comprises a toolretainer 16 having a backing plate 17, secured to one side-thereof,

and having abore118 therein for interchangeably receiving the shank'portions l9 ofsuitabletools; a a

"In order to lock the tools within thefre- I'-tainer-16,-I provide a locking device or memdrical enlarged head portion arranged within a correspondingly shaped recess 24 formed in the upper surface of the retainer 16. The recess 24 communicates with the bore 18 at the upper end of the latter and is 5 normally closed by means of a plug 25 having a pressed fit with the upper end of the cylindrical recess and relieved as at 26 to provide clearance for the shank portions 19 of the 7 tools. Thus, from the foregoing it will be 10 the locking member is such that a portion of the periphery of the latter projects into Accordingly, the shank portions of the tools are slotted as at 27 for the reception of the peripheral portions of the substantially cylindricalhead 23. However, in order to permit the tools to be assembled with or removed from the retainer, a portion of the cylindrical head23 is radially cut as at 28 on a radius coincident with the radius of the bore18 so that when the lockingmember is rotated to its inoperative position, the radial cut 28 registerswith the bore 18 to provide an unobstructed passage therethrough. Rotation of the locking member 20 to its various adjustedpositions may be effected in various 5 differentways. However, as shown herein,

the lower end of the shank 21 is provided with a counterbored portion suitably fashioned to receive a socket wrench or the like. Thus, it will be seen that the locking member 20 may be readily moved from. its operative position shown in Figure lwherein the toolis held in assembled relation with the retainer to its inoperative'position Wherein the radial cut coincides with the retainer bore and thereby permits removal of the tool. As previously stated, the locking member '20 serves to effectively hold the shankportions of the tools against axial or rotative movements relative to the retainer and furthermore, prevents accidental rotation thereofiwhenin operative position. In order to accomplish this result, the upperend of the enlarged head 23 is provided with a small helical plane surface 29 inclining upwardly from the radial cut 28 comparable to acertain extentto a screw thread. The spiral or lead of the helix 29 is such that as the locking member 20 is rotated in a counter-clock wise direction from'its inoperative position,

69 the helical planer surface; engages a corresponding surface. 30 formed ontheupper walls of the notches 27in the tool shanks 19,. It will be apparent that movement of the locking member asspecifiedabove Wedges 55 or cams the upper. endof the tool shanks-19 the bore 18 as clearly shown in Figure 1.

the same into wedging engagement with the side wall portions of the bore 18 opposite the locking member 20. It will be apparent from the foregoing that by reason of the cooperative'helical bearing surfaces upon the tool shanks and'locking member 20, the former are not only held against axial and rotative movement relative to the retainer, but accidental rotation of the locking member relative to the retainer is also prevented owing 'to the pressure and frictionbetween the two 'engaging'surfaces when in operative position. It will further'be apparent'that the enlarged substantially cylindrical head portion 23 of the locking member provides a relatively large bearing surface 31 for engagement with the retainer, with the result that any stripping load will be transmitted from the lockin member directly'to the retainer. I

When performing certain classes of work, itmay be desirable to supplementthe action of the helical surface" aforesaid in preventing accidental turning of the locking member while the tool is in actual service. The foregoing may be accomplished by providing cooperating angular conical surfaces 32 and 33 on the inner wall'of the punch notch and on the periphery of the locking member, respecti'vely. The surfaces 32 and 33 are preferably set at awedging angle with the axis of the locking member so that as the locking -member is'rotated to lock the punch and as the punch shank approaches the seat against the backing plate, the aforesaid complementary surfaces-contact with each other and the friction between them due to the pressure exerted prevents the locking member from rotating in its forward direction.

for receiving the coil spring 36. The coil However, v the construction issuch asto permit the lockspring 36 is preferably of the compression type and is arranged in the assembly insuch amanner that one end of the same en- Referring now briefly to the-operation of the tool holders specified above and assummg that, the loclnngmembers are in their inoperat ve positions audit is desired to secure a tool inp-lace, the operator merely in serts the shank of the desired toolwithin the bore 18 until the upper end of the shank engages the backing plate 17 and the notch in the punch shank is aligned with the locking member. When this is accomplished, a suitable socket Wrench or other'toolis engaged Within the polygonallyv-shapedrecess in" the lower end of the shank and the latter turned in a counter-clockwise direction to move the radial out portions of the head out of registration with the bore and to subsequently engage the helical surfaces of the head portion within the notch in theshank. Owing to the configuration of the helix on the head p0- tions of the locking members, the latter upon continued rotation in a counter-clockwise direction urges the upper end of the shank into wedging engagement with the side walls of the bore and with the backing plate as pre- What I claim as my invention is:

viously set forth." In themodifie'd form of the construction, movement ofthe locking member to its operative. )osition is assisted by the action of the coil spring 28. j

Thus, from the foregoing it is believed obvious that I have provided an extremely simple and readily operable means for interchangeably'receiving tools of the desired s1 ze or type and to effectively hold these tools in operative positions.

1. In a tool holder, a body havinga bore for holding the shank in thebore against both axial and rotary movements including a substantially cylindrical member, mounted for rotary movement inthe body and having an enlargement movable transversely'of the bore, having an inclined surface engageable with the shank to force it against the seat, and having another inclined portion for forcing the shank against'a wall of the bore.

2. In a tool holder, a body having a bore extending through one side thereof for re-.

ceiving the shank of a tool, a seat fo'r the shank at one end of the bore, and means for holding the shank 1n the bore against said seat, including a rotary member journaled in the body at one side of the bore, accessible and operable fronithe s de aforesaid. of the body, and having a portion within the bore actuable by the member for en' 'agement with a notch in a shank in the bore ,"the inner wall .tated to"operativer'locking position the friction betweenitheicurved surfaces will be such --as to, cause the set at a wedgingangle with the axis of. the rotary member so that asthe latter is roparts to be firmly held in locked position. I

' 8. In a tool holder,a body having a bore for receiving the shank of a tool, a seat for the shank at one end of the bore, and means for holding the shank in'en'gagement with said "seat'including a rotary member journaled in the body and having a head ex tending into the bore for engagement with a tool shank therein, said head having a notch in its periphery to permit a tool shank to be moved longitudinally of the bore toward'and away from the seat,and said head also having a helical cam surface operable after the tool shank has been moved towardits seat to cam the said shank axially into firm en gagement with said seat, and yieldable means within the body and associated with thehead for maintaining the cam surface thereof in 1 'ofthe notch and the periphery of the said M portion-having cooperating curved surfaces Li I mounted for rotary movement in the body in j substantially parallel relation to the bore;

, and having an enlargement movable transversely of the bore, provided with a groove that is registrabl-e, with. the bore to permit the shank of a toolto be moved longitudinally of the bore into engagement with said seat, and having means adapted to have a.

7 binding engagement with said shank.

5. In a tool holder, a body having a bore intermediate the: ends of andopening into.

forreceiving the shank of ,atool, a recess stantially parallel to the first and opening into the recess, a seatfor the shank at one end of thefirst mentioned bore, and a locking member mounted to turn in the second bore and having a substantially circular head in V" the recess and first mentioned bore, having 3 means re istrable with the first mentioned bore to permit a tool shank'to be moved longitudinally of the bore toward and away] from said seat, and having other meansfor wall of said bore.

forcing the tool shank against said seat and af 6. IA tool holder comprising a retainer hav-;

ing' a bore therein for interchangeably reg' Sh nks of tools, a substantially" :4 emma @110 transmit stripping leads thereto, the axis of :retation of said :enlargementi'being 'coineident withdjhe axis of rotationiof the 'memher, saidienlangement being movable .in the ;bore by :the member, having a relief registmble with the bore in one rotative position of -the member to permit a tool shank to 'be inserted into and removed frOmIthe bore, and having means-for holdingia tool shank in the "bore. a

'In testimony whereof I affix my signature. FERRIS T. HARRINGTON. 

